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Hypothesis: homozygosity in Tourette syndrome
D E Comings1, B G Comings, E Knell
1Department of Medical Genetics, City of Hope National Medical Center, Duarte, California 91010.
American Journal of Medical Genetics
|November 1, 1989
Summary
Genetic evidence suggests Tourette syndrome (TS) may involve homozygosity for a specific gene. Inheritance patterns appear semi-dominant and semi-recessive, impacting tic disorders and associated behaviors.
Area of Science:
- Genetics
- Neuroscience
- Psychiatry
Background:
- Tourette syndrome (TS) is a complex neurological disorder.
- Understanding the genetic basis of TS is crucial for effective treatment and management.
Purpose of the Study:
- To review evidence supporting a genetic hypothesis for Tourette syndrome.
- To explore the inheritance patterns of TS and associated behaviors.
Main Methods:
- Analysis of 1,200 Tourette syndrome family pedigrees.
- Comparative analysis of tic disorder and associated behaviors in 170 TS families versus control families.
- Biochemical studies on blood serotonin and tryptophan levels.
Main Results:
- Evidence suggests individuals with TS may be homozygous for a Tourette syndrome gene.
- Observed occurrence of tics and associated behaviors (OCD, ADHD, substance abuse) across maternal and paternal lines.
- Biochemical data support genetic linkage.
Conclusions:
- Tourette syndrome inheritance may be best described as semi-dominant, semi-recessive.
- This genetic model has implications for understanding TS etiology and potential therapeutic targets.